Disassembly Of Main Gear Oleo; Cleaning, Inspection And Repair Of Main Gear Oleo - Piper Dakota Maintenance Manual

MAIN GEAR
MAIN GEAR OLEO
DISASSEMBLY OF MAIN GEAR OLEO (figure 32-1)
The main gear axle and piston tube assembly can be removed from the cylinder housing with either the
gear removed from or installed on the airplane. On some airplanes the metering components of the gear that
are located in the top of the housing may be removed, but only with the gear removed from the airplane. (Refer
to Removal of Gear.)
1. Place airplane on jacks. (Refer to chapter 7.)
2. Place a drip pan under main gear to catch spillage.
3. Remove gear axle and piston tube assembly as follows:
a. Remove air from oleo chamber by depressing air valve core pin found in inspection hole on top of
wing. After pressure in oleo chamber is released, remove valve core pin. Attach a small hose to the
air valve, and drain fluid by slowly compressing piston tube. If it is desirable to extract more fluid
from chamber, remove filler plug, insert a siphon hose and drain fluid from upper area of housing.
b. Disconnect flexible brake line at elbow on brake assembly.
c. Disconnect torque link assembly by removing any one of three cotter pins, nuts, washers, and
bolts. Note arrangement of components for installation. Carefully slide piston tube from cylinder
housing.
d. Remove scraper ring located inside lower end of cylinder housing by removing retainer ring,
spacer ring, and then scraper ring.
e. Remove O-ring seal located just before the scraper ring using a curved wire or spoon shaped tool
and inserting it under ring.
4. Remove cylinder head and orifice assembly as follows:
a. Cut safety wire and remove bolts securing cylinder head in top of housing. Remove assembly from
housing.
b. Lubricate and install an O-ring on cylinder head assembly.
c. Remove orifice assembly from within housing by rotating it counterclockwise out of housing with
a 0.50 x 0.125 stud type spanner wrench. (Refer to chapter 95.) Do not remove orifice unless
replacement is necessary.
CLEANING, INSPECTION, AND REPAIR OF MAIN GEAR OLEO
1. Clean all parts with a suitable dry-type cleaning solvent.
2. Inspect landing gear oleo components as follows:
a. Bearing surfaces of housing for excess wear, corrosion, scratches, and overall damage.
b. Retaining ring for cracks, burrs, etc.
c. Cylinder tube for corrosion, scratches, nicks, excessive wear, and misalignment.
d. Air valve for operation and general condition.
e. Orifice plate for hole restriction.
3. Repair of oleo is limited to smoothing out minor scratches, nicks, dents, and replacement of parts.
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
2B16
32 - 11 - 00
Page - 32-04
Reissued: August 1, 1986